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Olympiad problem: Each of the following shapes is a combination of two shapes with different sizes △, □, ○. What should be filled under other shapes?
Each number corresponds to a two-digit number, a ten-digit two-digit number-what is an external number, a one-digit two-digit number-what is an internal number. So we know:
The big triangle is 1 and the small triangle is1; The big circle is 2 and the small circle is 4. The big square is 3 and the small square is 5;
So the corresponding numbers in the following figure are 34, 25, 35, 14, 2 1 in turn.